How to Get Over Jet Lag: A Science-Backed Recovery Guide

You land in a new city, and your body is convinced it's still the middle of the night. You can't sleep when you should, you're exhausted when you shouldn't be, and your stomach feels off. That groggy, scrambled feeling has a name: jet lag. The good news is that it's temporary, and a few well-timed habits can help you recover much faster than just waiting it out.

What is jet lag, exactly?

Jet lag is a temporary mismatch between your internal biological clock and the local time at your destination. Your body runs on a roughly 24-hour circadian rhythm that governs when you feel sleepy, alert, and hungry. When you fly across several time zones, that internal clock stays set to where you came from while the world around you has moved on, leaving the two out of sync.

Symptoms usually appear only when you cross 3 or more time zones, because your circadian system can't immediately adapt past that threshold. Common signs include trouble falling asleep or waking too early, daytime sleepiness, difficulty concentrating, a general feeling of malaise, stomach upset, and mood changes. Jet lag is recognized as a circadian rhythm sleep disorder (the jet lag type).

How long does jet lag last?

Left alone, your body clock realigns slowly and predictably. The natural rate is roughly 1 time zone per day after eastbound travel and about 1.5 time zones per day after westbound travel. So a 6-time-zone trip heading east can take about 6 days to fully resolve without any intervention.

That direction difference is real, not just in your head. Eastward travel is generally harder than westward, because it asks your body to fall asleep earlier than it wants to. How rough your jet lag feels also depends on the distance, the flight duration, and the total number of time zones you cross. The strategies below are about shortening that timeline rather than enduring it.

How to get over jet lag faster

The single most powerful tool you have is light. Light is the strongest regulator of your circadian rhythm, and using it strategically can pull your clock toward local time. Beyond light, the goal is simple: adopt your destination's schedule as fast as possible.

Practical, evidence-based steps:

• Switch to destination time immediately. On arrival, eat, sleep, and wake on the local schedule, especially when crossing more than 3 time zones.
• Use light deliberately. After traveling more than 8 time zones east, avoid bright morning light and seek late-afternoon sunlight. After traveling more than 8 time zones west, avoid sunlight in the hours before dark.
• Use caffeine and exercise strategically during the day, but avoid both in the evening so they don't keep you up.
• Skip alcohol, which fragments sleep and worsens dehydration.
• Eat small meals rather than heavy ones to ease the digestive side of jet lag.
• Prep before you go. In the 2-3 days before departure, shift your sleep and wake times by 1-2 hours per day, later for westward travel and earlier for eastward travel, to reduce how long you'll need to adjust.

Does melatonin help with jet lag?

For many travelers, yes. A Cochrane systematic review found melatonin to be remarkably effective at preventing or reducing jet lag, with a number needed to treat of 2, meaning roughly 1 in 2 travelers benefits compared with placebo. It's recommended particularly for adults crossing 5 or more time zones, especially when heading east.

Timing matters more than dose. Melatonin works best taken close to your target bedtime at the destination (around 10 p.m. to midnight). Taken too early in the day, it can cause sleepiness and actually delay your adjustment. As for amount, doses between 0.5 mg and 5 mg are similarly effective; people tend to fall asleep faster on 5 mg, but doses above 5 mg are no more effective, and Mayo Clinic notes that even a low 0.5 mg dose can work. Occasional short-term use appears safe for most people, but use caution if you have epilepsy or take the blood thinner warfarin, and check with a clinician first.

Jet lag vs. ordinary travel fatigue

It's easy to blame jet lag for every post-flight slump, but the two aren't the same. General travel fatigue comes from the trip itself, the cramped seat, dehydration, broken sleep, and long hours in transit, and it tends to ease within a day or so of rest, regardless of which direction you flew.

True jet lag is specifically a clock problem. It shows up when you cross multiple time zones and persists because your internal rhythm is genuinely out of phase with local time. A simple tell: if you flew north-south without changing time zones and still feel wiped out, that's travel fatigue, not jet lag. Jet lag responds to light timing, schedule shifting, and sometimes melatonin, while plain fatigue mostly responds to rest and hydration.

When to see a doctor

Jet lag is self-limiting and usually resolves on its own as your body clock catches up. But it's worth talking to a clinician if your sleep disruption lingers well beyond the expected adjustment window, if it keeps recurring with frequent travel, or if it's seriously affecting your mood, focus, or daily functioning.

You should also check in before reaching for sleep aids or melatonin if you're pregnant, have a chronic condition like epilepsy, or take medications such as warfarin or other prescriptions that could interact. And as always, sudden or severe symptoms that don't fit the usual jet lag picture deserve prompt medical attention rather than being written off as travel-related. If you'd like a plan tailored to your health and travel patterns, a quick check-in with a clinician, including through a service like Nolla, can help.